Moving a Septic Tank and Leach Field: Practical Considerations and Solutions

Many homeowners find themselves debating the best placement of their septic tank and leach field. In some cases, a septic tank may be located in a less ideal spot, making the installation of a leach field a challenge. This situation arises when the homeowner needs a new field but can't fit it within the required regulations in the backyard where the septic tank currently is, yet ample space exists in the front yard.

Can the Leach Field Be on the Other Side of the House?

Typically, a leach field can be situated on the opposite side of the house from the septic tank. This is feasible due to the allowable distance restrictions. However, practical considerations include the slope of the land, the water table depth, and regulations set by the local health department.

Generally, for proper drainage, the leach field requires a 1/4 inch drop per foot of run. This means that a 100-foot run may require a two-foot drop, which can be a challenge if the water table is shallow or if you're trying to avoid deeper and more expensive trenching. This is a key consideration, especially if the water table is near the surface.

It is crucial to include regular cleanouts along the leach field to facilitate maintenance. Cleanouts should be installed at intervals and, especially at any bends, to ensure that future clogs can be easily cleared.

Technical Challenges and Solutions

Cost is a primary concern, but other practical issues might include buried utility lines, water wells, and other potential hazards. If your local regulations allow it, you can consider dividing the current drainfield into two parts using a diversion valve. This approach involves letting half of the drainfield rest while the other is in use. After the resting half recovers, the system can be alternated every year to allow for rotation and restoration.

If the drainfield fails to absorb water adequately, the septic system may need to be treated as a holding tank until the resting half of the drainfield has recovered. This process takes around a year.

Regulatory and Environmental Considerations

The placement of a leach field near a septic tank is highly regulated. In some states, such as Louisiana, the leach field must be within a specific distance of the septic tank. If crossing a water body, such as a well, is involved, the feasibility of moving the leach field will be heavily dependent on local regulations and engineering assessments.

Practically, there is no fundamental reason why a leach field cannot be on the opposite side of the house as the septic tank. However, a sewage pump may be required if the field's input is higher than the tank's output. A pump system can be installed next to the septic tank to ensure proper drainage to the leach field. This solution would necessitate an underground power supply and a connecting pipe for the pump output to the field.

Conclusion

The decision to move a septic tank and leach field should be based on a thorough understanding of the local regulations, the practical aspects of the land, and the resources available. With proper planning and consultation with local health departments and engineers, a functional and compliant septic system can be implemented even when faced with unusual site constraints.